Method for reducing diameter of medical single-strand suture line

Abstract

The invention discloses a medical single-strand suture line diameter reducing method which comprises the following steps that S1, a single-strand suture line body and a diameter reducing die are prepared, a hole channel is formed in the diameter reducing die, the hole channel of the diameter reducing die and a hole channel of a needle body are manufactured in the same ratio, and the hole diameter of the hole channel is smaller than the suture line diameter; and S2, a heating element is used for heating the reducing die to the temperature higher than the softening temperature of the thread body and slightly lower than the melting point, the thread body is held by hand, one end of the thread body is inserted into a hole channel of the reducing die by 2-3 mm, then the thread body is rapidly pulled out and naturally cooled, and the reduced needle and thread connecting section is obtained.

Description

Technical Field

[0001] The invention relates to a method for manufacturing a surgical instrument, in particular to a method for reducing the diameter of a medical single-strand suture thread. Background Art

[0002] The medical needle and thread connection in the prior art is that the thread body is inserted into the hole at the tail end of the needle body and then squeezed and fixed by a needle press. The needle threading technology requires that the hole diameter is larger than the thread diameter. Generally, the ratio of the needle diameter to the thread diameter is greater than 2:1, resulting in the thread being unable to block the needle eye. Bleeding from the needle eye is very common, which not only affects the field of vision and increases the difficulty of surgical operation, but also causes chronic blood loss in patients and increases the chance of infection in patients. If a needle 1 to 2 sizes smaller is used, the needle diameter becomes thinner, the aperture decreases, and the ratio of the needle diameter to the wire diameter will be reduced. Combined with the contraction of human tissue, the needle eye can be partially or completely blocked to reduce or prevent bleeding from the needle eye, but the aperture is smaller than the wire diameter, which brings about a problem of needle and thread connection. The Chinese invention patent application with publication number CN116473604A includes a synchronous pulley displacement module, a reverse motion module, a wire release module, a heating module, a pneumatic scissors, a workbench and an electric control box; the pneumatic scissors are located on one side of the reverse motion module, and the wire release module is located on the other side of the reverse motion module. When a section of the suture is heated to a molten state by an electric heating device, it is stretched and retracted and then sheared from the middle, and then solidified to form a needle and thread connection section with a reduced diameter, which is particularly suitable for the end diameter reduction of non-absorbable sutures such as polypropylene, but the processing technology is complicated, and it is particularly not suitable for absorbable sutures such as polydioxanone, which may be related to the thermal elasticity of certain biomaterials.

[0003] Sutures are available in two forms: single strand and multiple strands, with multiple strands being braided. In recent years, with the rise of knot-free (barbed) sutures, the use of single strand sutures has increased, and it is necessary to seek other technical approaches for single strand sutures with a certain degree of rigidity. Summary of the invention

[0004] In view of the shortcomings of the prior art, the present invention proposes a method for reducing the diameter of a medical single-strand suture thread, which can easily reduce the diameter of the end of the single-strand suture thread, so that the thread body can be connected to a needle body that is one size smaller than the conventional configuration, thereby reducing the needle diameter and wire diameter ratio, reducing or preventing the phenomenon of bleeding from the needle eye.

[0005] To achieve the above objectives, the present invention is implemented through the following technical solutions:

[0006] A method for reducing the diameter of a medical single-strand suture thread comprises the following steps:

[0007] S1: prepare a single-strand wire body and a diameter reduction die, and set a channel on the diameter reduction die. The channel of the diameter reduction die is made in the same size as the channel of the needle body, and its hole diameter is smaller than the wire diameter;

[0008] S2: Use a heating element to heat the reduction die to a temperature above the softening temperature of the wire and slightly below the melting point. Hold the wire and insert one end into the reduction die hole 2 to 3 mm, then quickly pull it out and cool it naturally to obtain a reduced diameter needle and thread connection section.

[0009] As a preferred technical solution of the present invention, the wire diameter is 0.27-0.33 mm, and the diameter of the reduction die is 0.26 mm.

[0010] As a preferred technical solution of the present invention, the wire diameter is 0.34-0.40 mm, and the diameter of the reduction die is 0.33 mm.

[0011] As a preferred technical solution of the present invention, the wire diameter is 0.41-0.47 mm, and the diameter of the reduction die is 0.40 mm.

[0012] As a preferred technical solution of the present invention, the wire diameter is 0.48-0.55 mm, and the diameter of the reduction die is 0.47 mm.

[0013] As a preferred technical solution of the present invention, the wire diameter is 0.56-0.64 mm, and the diameter of the reduction die is 0.55 mm.

[0014] As a preferred technical solution of the present invention, the reducing die channel is provided with a chamfer to facilitate the insertion of the wire body.

[0015] As a preferred technical solution of the present invention, the inner wall of the channel of the reduction die is polished.

[0016] As a preferred technical solution of the present invention, the wire body is a single strand (filament) made of polypropylene PP, polyester PET, polyamide PA, polylactic acid PLA, polyglycolic acid PGA, polydioxanone PPDO, polytrimethylene carbonate PTMC, polyglycolic acid PGLA or poly(glycolide-co-ε-caprolactone) PGCL.

[0017] Working principle: When the end of the wire body contacts the opening of the shrinking die, the outer periphery of the wire body first touches the wall and is heated and softened, while the center has not yet softened. In this state, the wire body is squeezed by the external force and the hole in both directions, and the center of the wire body enters the hole, thereby obtaining a reduced-diameter needle-thread connection section. After the peripheral tissue of the wire body is deformed, a shoulder is formed at the opening of the hole. At this time, the shoulder diameter is still smaller than the needle diameter, and the needle eye will not be enlarged during the subsequent surgery.

[0018] Beneficial effects: The present invention provides a reducing die, and a channel on the reducing die. The reducing die channel is made in the same size as the needle body channel, and its hole diameter is smaller than the wire diameter. The wire body is inserted into the channel in a heated and softened state, and then quickly pulled out and naturally cooled to obtain a reduced-diameter needle and thread connecting section, which is convenient for subsequent needle and thread connection, making the single-strand suture thread reducing processing method simple and extremely low-cost. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 It is a schematic diagram of a medical single-strand suture thread before its diameter is reduced.

[0020] Figure 2 It is a schematic diagram of a medical single-strand suture thread after its diameter is reduced according to the present invention. DETAILED DESCRIPTION

[0021] The following will be combined with the attached Figures 1-2 , clearly and completely describe the technical solutions in the embodiments of the present invention.

[0022] Example 1

[0023] A method for reducing the diameter of a medical single-strand suture thread comprises the following steps:

[0024] S1: prepare a polyester single-strand wire 1 with a wire diameter of 0.40 mm; a reducing die 2, and set a hole 3 on the reducing die 2. The hole 3 is made in the same size as the needle body hole, and its hole diameter is 0.33 mm;

[0025] S2: Use a heating element to heat the reducing die 2 to 230-240°C, hold the wire body 1 and insert one end into the channel 3 for 2-3 mm, then quickly pull it out and cool it naturally to obtain a reduced diameter needle and thread connection section 4.

[0026] Example 2

[0027] A method for reducing the diameter of a medical single-strand suture thread comprises the following steps:

[0028] S1: prepare a polydioxanone single strand wire 1, the wire diameter is 0.64 mm; a diameter reduction die 2, a hole 3 is set on the diameter reduction die 2, the hole 3 is made in the same size as the needle body hole, and the hole diameter is 0.55 mm;

[0029] S2: Use a heating element to heat the reducing die 2 to 105-110°C, hold the wire body 1 and insert one end into the channel 3 for 2-3 mm, then quickly pull it out and cool it naturally to obtain a reduced diameter needle and thread connection section 4.

[0030] Obviously, the described embodiments are only some embodiments of the present invention, not all embodiments. All other embodiments obtained by ordinary technicians in this field without creative work within the spirit and principles of the present invention, as well as any modifications, equivalent substitutions, improvements, etc. made, should be included in the protection scope of the present invention.

Claims

1. A method for reducing the diameter of a medical single-strand suture, characterized in that: The following steps are involved: S1: prepare a single-strand wire body and a diameter reduction die, and set a channel on the diameter reduction die. The channel of the diameter reduction die is made in the same size as the channel of the needle body, and its hole diameter is smaller than the wire diameter; S2: Use a heating element to heat the reduction die to a temperature above the softening temperature of the wire and slightly below the melting point. Hold the wire and insert one end into the reduction die hole 2 to 3 mm, then quickly pull it out and cool it naturally to obtain a reduced diameter needle and thread connection section.

2. A method for reducing the diameter of a medical single-strand suture according to claim 1, characterized in that: The wire body has a diameter of 0.27 to 0.33 mm, and the diameter of the reducing die is 0.26 mm.

3. A method for reducing the diameter of a medical single-strand suture according to claim 1, characterized in that: The wire body has a diameter of 0.34-0.40 mm, and the diameter of the reducing die is 0.33 mm.

4. A method for reducing the diameter of a medical single-strand suture according to claim 1, characterized in that: The wire body has a diameter of 0.41 to 0.47 mm, and the diameter of the reducing die is 0.40 mm.

5. A method for reducing the diameter of a medical single-strand suture according to claim 1, characterized in that: The wire body has a diameter of 0.48 to 0.55 mm, and the diameter of the reducing die is 0.47 mm.

6. A method for reducing the diameter of a medical single-strand suture according to claim 1, characterized in that: The wire body has a diameter of 0.56-0.64 mm, and the diameter of the reducing die is 0.55 mm.

7. A method for reducing the diameter of a medical single-strand suture according to claim 1, characterized in that: The reducing die channel is provided with a chamfer for facilitating the insertion of the wire body.

8. A method for reducing the diameter of a medical single-strand suture according to claim 1, characterized in that: The inner wall of the reducing die channel is polished.

9. A method for reducing the diameter of a medical single-strand suture according to claim 1, characterized in that: The thread is a single strand (filament) made of polypropylene PP, polyester PET, polyamide PA, polylactic acid PLA, polyglycolic acid PGA, polydioxanone PPDO, polytrimethylene carbonate PTMC, polyglycolic acid lactic acid PGLA or poly (glycolide-co-ε-caprolactone) PGCL.

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